JP2017003116A - Joint yoke for universal joint and universal joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joint yoke for a universal joint improved in durability.SOLUTION: A joint yoke 7 has a first yoke arm rotatable on a rotational axis X and including a first bearing hole 13, and a second yoke arm including a second bearing hole. The first bearing hole and the second bearing hole are disposed on a bearing axis Y intersecting the rotational axis X at a right angle on a joint center M. The yoke arm has an outer part A in a radial direction to the rotational axis, and an inner part B adjacent to the outer part, a wall thickness d1 of the yoke arm is reduced at the outer part with respect to the inner part in the radial direction to the bearing axis on a plane orthogonal to the rotational axis and passing the joint center. The yoke arm has at least two recessed portions 33 disposed at both sides of each bearing hole, and these recessed portions are at least partially in parallel with the rotational axis.SELECTED DRAWING: Figure 8

Description

The present invention relates to a joint yoke for a universal joint and a universal joint provided with the joint yoke. The joint yoke can be driven to rotate about a rotation axis, and includes a first yoke having a first bearing hole. An arm and a second yoke arm having a second bearing hole, and the first bearing hole and the second bearing hole intersect the rotation axis at a right angle at a joint center. The yoke arm is disposed around a bearing axis, and the yoke arm has an outer portion in a radial direction with respect to the rotation axis, and an inner portion adjacent to the outer portion, and the wall thickness of the yoke arm Is reduced in the outer part relative to the inner part in a radial direction with respect to the bearing axis in a plane perpendicular to the axis of rotation and passing through the joint center.

  A joint yoke of this type is known from DE 2900846, which is manufactured from sheet metal.

  The universal joint has two joint yokes, and the yoke arms of the two joint yokes are connected to each other in a connected manner via a journaled cross assembly. The cross assembly with journal has one cross member, and this cross member has four journals protruding from the base body. In this case, two journals are paired and arranged around one common bearing axis. The journal is supported in the bearing hole of the yoke arm via a bearing device. Rolling bearings are often used and these rolling bearings are arranged in bearing bushes that are received in bearing holes. The rolling member of the rolling bearing rolls along an inner bearing surface formed by each journal and an outer bearing surface formed by a bearing bush inserted into the bearing hole or the bearing hole itself. While transmitting torque from one of the two joint yokes to the other joint yoke, an area of relatively high load is formed. In this case, the relatively rigid component of the yoke arm and the region of the torque transmitting member having the relatively large lever arm absorb most of the load. These areas of relatively high load are located radially outward with respect to the axis of rotation, i.e. at the end of the journal remote from the journal body.

  German Patent Application No. 10303291 discloses a cross member attached to a journal in order to achieve a more constant load distribution, in which the cross member is arranged on a common journal axis. Further, the inner bearing surface of at least two journals is formed by the outer peripheral surface of the journal or the outer peripheral surface of the bush. The inner bearing surface includes a first bearing surface portion disposed on a rotationally symmetric envelope surface concentrically arranged with respect to each journal axis, and a second bearing surface disposed inside the envelope surface. Bearing surface portion. The envelope surface extends from the base body in the direction of the free end while continuously reducing the distance to each journal axis, and extends over a portion of the periphery of each journal.

  Since the second bearing surface portion extends in the axial direction with respect to each journal axis while continuously reducing the distance from the journal axis, the load distribution of the bearing force is ensured in the axial direction. Furthermore, since the second bearing surface portion extends along only a part of the outer peripheral surface, a reduction in the maximum load is achieved in the main load area.

  However, it is a disadvantage that the journal of the cross assembly with the journal is forced to be relatively complicated to produce the corresponding bearing surface portion.

  In the solution disclosed in German Patent Application Publication No. 199539563, the cylindrical wall of the bearing hole is provided with a recess, and the recess extends along a part of the peripheral surface. It has a depth that varies in the axial direction of the axis. The journal of the cross member is attached to the bearing bush via a rolling bearing, and this bearing bush is accommodated in the bearing hole. Therefore, in the region of the recess located in the region of the main load area, the bearing bush can be deformed, so that the maximum load is reduced.

  DE 1425952 discloses a shaft with an elliptical cross-section to reduce the maximum load on a rolling bearing, this shaft being a rolling member type in the ring. It is supported by. In the region of the main load area, the shaft has the largest radius of curvature, so that the bearing load is more distributed in the rolling member body than in embodiments where the shaft has a circular cross section. However, there is a drawback that the distribution of the bearing load is not achieved in the axial direction of the shaft.

  German Offenlegungsschrift 2,933,505 shows a cross assembly with a journal comprising a journal rotatably supported in a bearing bush. A bearing bush is accommodated in the bearing hole of the joint yoke. The outer peripheral surface of the bearing bush is substantially cylindrical and has a flat portion in the region of the main load area. The flat portion extends over a part of the peripheral surface, and approaches the journal axis in the direction of the journal axis, starting from the base body on which the journal is formed, in the direction of each free end of the journal. Yes.

  In order to distribute the bearing load in the axial direction with respect to the journal axis, German Patent Application Publication No. 11222781 discloses a cross member with a journal having an outer peripheral surface formed in a conical shape. However, in this case, the distribution of the bearing load in the circumferential direction has not been achieved. Furthermore, the rolling member body is not in contact with the bearing surface of the bearing hole with a low load over the entire longitudinal direction.

  An object of the present invention is to provide a joint yoke for a universal joint having an improved service life.

  This problem is solved by a joint yoke having the features of claim 1. Preferred embodiments are obtained from the dependent claims.

  By reducing the wall thickness of the yoke arm in the outer part along the bearing hole with respect to the axis of rotation, the yoke arm becomes brittle in the area of this reduced wall thickness and becomes more elastic accordingly. Reduction of the journal support of the member is achieved in these outer parts. The Hertzian stress in the outer part is reduced, which improves the bearing life of the joint yoke more than proportionally. On the contrary, the load is increased in the inner portion along the bearing hole with respect to the rotation axis. However, since these inner parts have a lower load than the outer parts, a constant load is achieved in the direction of the bearing axis, which also improves the service life.

  Each yoke arm is provided with two recesses arranged on both sides of each bearing hole, and these recesses extend in parallel to each other and the rotation axis. These recesses are, according to the inventive concept, even if these recesses are arranged slightly tilted in order to allow production by the forging process, i.e. slightly angled with respect to the axis of rotation and with respect to each other. Even if arranged, it is considered parallel to the axis of rotation or to each other. Therefore, angular deviations up to 10 ° with respect to the axis of rotation are still considered parallel in the concept of the invention. This substantially corresponds to the inclination during general forging.

  Preferably, the wall thickness is reduced in a range of at least ± 45 ° about the bearing axis, starting from a plane arranged perpendicular to the axis of rotation and extending through the joint center.

  According to a preferred embodiment, the wall thickness is not reduced in the outer part along the bearing hole at the free end of the yoke arm, which is arranged in the radial direction of the axis of rotation. In other words, the wall thickness of the yoke arm is in a radial direction with respect to the bearing axis in a plane perpendicular to the rotation axis and passing through the joint center, and in the outer portion, the rotation axis and the bearing. Less than the other outer part in the region of the free end of the yoke arm, which is arranged in a radial direction with respect to the axis of rotation in a plane containing the axis.

  Each said outer part along the bearing hole starts from the outer end of the bearing hole with respect to the rotational axis and extends over a part of the longitudinal direction of the bearing hole in the direction of the rotational axis. On the other hand, the inner portions are directly followed, and these inner portions do not necessarily extend to the inner end of the bearing hole. Thus, the generally inwardly disposed portion can be adjacent to the inner portion, in which case the wall thickness of the generally inner portion is reduced again relative to the inner portion. be able to.

  The wall thickness of the yoke arm can be reduced along most of the circumference around the bearing hole, i.e. over half the circumference around the bearing hole, in which case the reduced part is at least 2 It can be divided into two circumferential parts.

  In one aspect, the yoke arm has a concave portion on the outer side with respect to the rotation axis, and the concave portion extends along the longitudinal direction of the outer portion of the bearing hole, so that the wall thickness is increased. Has been reduced. The recess is provided on the outer surface of the yoke arm with respect to the rotational axis.

  The joint yoke has a base portion from which the yoke arms protrude parallel to each other. The joint yoke preferably has a recess between the bearing axis and the base portion, the recess extending at least partially around the bearing axis in order to reduce the wall thickness.

  The invention is achieved on the one hand by a universal joint having a joint yoke as described above, in which case this joint yoke is connected to another joint yoke via a cross member. In this case, this other joint yoke may also be the joint yoke described above.

  The wall thickness of the yoke arm is not reduced in the outer part at the free end of the yoke arm, or there is no recess in this part.

  Preferred embodiments are described in detail below with reference to the drawings.

It is a semi-longitudinal sectional view of a universal joint shaft. It is a semi-longitudinal sectional view showing a first mode of a joint yoke according to the present invention. FIG. 3 is a partial cross-sectional view of the joint yoke of FIG. 2. FIG. 3 is a side view of the joint yoke of FIG. 2. It is a fragmentary longitudinal cross-section which shows the 2nd aspect of the coupling yoke by this invention. FIG. 6 is a partial cross-sectional view of the joint yoke of FIG. 5. It is a side view of the joint yoke of FIG. FIG. 2 is a cross-sectional view of a yoke arm of a joint yoke according to two embodiments, where the upper half shows a prior art joint yoke and the lower half shows the joint yoke of FIG. It is a half longitudinal cross-sectional view which shows the 3rd aspect of the joint yoke of FIG. 2 as a forged component. FIG. 10 is a partial cross-sectional view of the joint yoke of FIG. 9. FIG. 6 is a semi-longitudinal sectional view showing a fourth aspect of the joint yoke of FIG. 5 as a forged component. FIG. 12 is a partial cross-sectional view of the joint yoke of FIG. 11. It is a semi-longitudinal sectional view showing the 5th mode of a joint yoke. FIG. 14 is a partial cross-sectional view of the joint yoke of FIG. 13.

  FIG. 1 shows a universal joint shaft 1, which connects two universal joints 2 and 3, and these two universal joints 2 and 3, and changes the distance between them. It has one shaft 4 that can be made. The two universal joints 2 and 3 are aligned around the rotation axis X. Each universal joint is connected to the shaft 4 in a non-rotatable manner, the first inner joint yokes 5 and 6 in the form of a so-called tube yoke, and a so-called flange yoke which is also connected to the shaft 4 in a non-rotatable manner. Second outer joint yokes 7 and 8 and journaled cross assemblies 9 and 9 ', and the first joint yokes 5 and 6 and the second joint yokes 9 and 9' The joint yokes 7 and 8 are connected to each other so as to be rotatable.

  The universal joint shaft of FIG. 1 is shown as a schematic view, and will be described later in the first embodiment shown in FIGS. 2, 3, and 4 or later in FIGS. 5, 6, and 7. It has at least one joint yoke corresponding to the second aspect. One universal joint shaft may have a plurality of joint yokes according to any one of modes described later. Since the following two aspects of the joint yoke are formed as flange yokes, these yokes can function as the second outer joint yokes 7 and 8. In the following, a plurality of examples are shown starting from the fact that the second joint yoke of the universal joint shown on the left corresponds to one of the following aspects. Obviously, both outer joint yokes, or only the right side outer joint yoke, may be formed as described below. The joint yokes of the following aspects may be formed as tube yokes, ie first joint yokes, in which case these joint yokes may have any combination of one of the following aspects: good.

  2 to 4 show the first aspect of the second joint yoke 7 from different viewpoints. 2 is a partial longitudinal sectional view of the second joint yoke 7, FIG. 3 is a partial transverse sectional view, and FIG. 4 is a side view. The second yoke 7 is rotatable about the rotation axis X and has a base portion 10 from which the first yoke arm 11 and the second yoke arm 12 are mutually connected. It projects in parallel and parallel to the rotation axis X. The first yoke arm 11 is provided with a first bearing hole 13, and the second yoke arm 12 is provided with a second bearing hole 14. The two bearing holes 13 and 14 are aligned around a common bearing axis Y and are therefore aligned with each other. The bearing axis Y is disposed at right angles to the rotation axis X and intersects the rotation axis X at the joint center M. The first bearing hole 13 and the second bearing hole 14 are formed as through holes, and thus extend through the yoke arms 11 and 12 in the radial direction with respect to the rotation axis X, respectively. As will be described in more detail below, in order to support the journal of the cross member, a bearing bush 21 is inserted into the yoke arm, and the bearing bush 21 is in a lock groove 15 extending around the bearing axis Y. It is fixed by a lock ring arranged in the.

  On the opposite side of the yoke arms 11, 12, the base part 10 has a flange 16 by means of which the second joint yoke 7 can be driven or connected to a driving component. In general, a journal may be provided that can be connected to the shaft component of the shaft of FIG. 1 instead of the flange. The mode provided with the journal is shown in FIGS. The journal shown there may be provided in this or similar form in another manner.

  The cross member has journals protruding from the base body, these journals are arranged in pairs and are centered on each other and aligned in opposite directions. The first yoke arm 11 has a first assembly recess 19 facing inward at the first free end 17 so that the cross member can be attached. The second yoke arm 12 has a second assembly recess 20 facing the inside and disposed at the second free end 18. Accordingly, the two yoke arms 11 and 12 are arranged at right angles to the bearing axis Y and are formed mirror-symmetrically with respect to a plane including the rotation axis X. The assembly recesses 19 and 20 facilitate the insertion of the cross member into the bearing holes 13 and 14, and in this case, one journal of the cross member is tilted first and passed through the first assembly recess 19. Then, it is inserted into the first bearing hole 13. When this journal is inserted deeply into the first bearing hole 13, the second journal is inserted into the second bearing hole 14 until the opposite journal is inserted into the second bearing hole 14 by moving the entire cross member. Can be passed through the assembly recess 20. The bearing bush can then be inserted into the bearing holes 13, 14 from the outside and then fixed by a lock ring inserted into the lock groove 15.

  FIG. 8 shows a cross-sectional view of the first yoke arm 11, and the lower part in FIG. 8 corresponds to the second joint yoke 7 shown in FIGS. 2 to 4. The upper part shown above the bearing axis Y corresponds to a common joint yoke according to the prior art.

  FIG. 8 shows the first yoke arm 11 having the first bearing hole 13. A bearing bush 21 is inserted into the first bearing hole 13. The bearing bush 21 accommodates a plurality of rolling members in the form of rollers 22. These rollers 22 are arranged around the rotation axis X, and are provided in two rows along the bearing axis Y. The roller 22 rolls along the outer bearing surface 23 of the bearing bush 21. The roller 22 rolls along the inner bearing surface 24 of the journal 25 of the journal cross member 30. The cross member 30 has a base body 26, and four journals 25 protrude from the base body 26. Of these four journals, two journals are paired and positioned around the bearing axis Y, and are directed away from each other.

  The bearing bush 21 has a sleeve wall 31. The sleeve wall 31 is formed in a cylindrical shape, and the bearing bush 21 is inserted into the first bearing hole 13 through the sleeve wall 31. The inner surface of the sleeve wall 31 forms an outer bearing surface 23. Furthermore, the bearing bush 21 has a sleeve bottom portion 28 that closes the bearing bush 21 outward with respect to the joint center M. The bearing bush 21 is supported on a lock ring 29 disposed in the lock groove 15 via a sleeve bottom portion 28.

  The roller 22 rolls in the bearing bush 21 in the axial direction with respect to the bearing axis Y toward the pressure plate 27, in which case the pressure plate 27 is supported on the sleeve bottom 28. In the reverse direction, the roller 22 is supported by a ring (not shown) attached to the sleeve wall 31 and held in the bearing bush 21. Generally, the ring is also provided with sealing means for sealing the bearing bush 21 in a direction toward the base body 26 with respect to the cross member 30. For clarity, the ring and sealing means are not shown.

  The journal arranged with respect to the base body 26 facing away from the illustrated journal 25 is supported by the second yoke arm so as to correspond. A journal (not shown) arranged perpendicular to the bearing axis Y is supported in the bearing hole of the first joint yoke in a corresponding manner. Therefore, torque can be transmitted between the second joint yoke 7 and the first joint yoke, so that the universal joint shaft and the universal joint rotate about the rotation axis X. In this case, the force is formed in the drawing plane of FIG. 8, and this force acts from the journal 25 to the first yoke arm 11 when the first joint yoke is a drive member, via the bearing, It also acts on the surfaces 23, 24 and the roller 22. The bearing load in the form of the second joint yoke 7 is shown as a trapezoid in the lower half and below the joint yoke. The bearing load of the joint yoke according to the prior art is shown in FIG. 8 as a trapezoid by the upper half of the drawing above the joint yoke embodiment.

  First, it can be seen that the bearing load is highest radially outward with respect to the axis of rotation X, and here the lever arm is also maximal for force transmission. The bearing load decreases inward. According to the prior art, it can be seen that the bearing load is clearly greater on the radially outer side than on the radially inner bearing load.

  In order to make the bearing load according to this aspect uniform, a first recess 33 is provided on the outer surface 32 of the first yoke arm 11 shown in the lower part of FIG. FIG. 4 shows that the first recess 33 is arranged on one side of the first bearing hole 13 with respect to the rotation axis X and extends parallel to the rotation axis X. Yes. Further, a second recess 34 is provided, and this second recess 34 is provided on the other side of the first bearing hole 13 and extends in parallel to the rotation axis X. Yes. The recesses 33 and 34 partially extend around the rotation axis X and extend to the third recess 35 provided in the base body 10 between the first yoke arm 11 and the flange 16. doing.

  By providing the first concave portion 33 and the second concave portion 34, a cross section perpendicular to the rotation axis X, that is, a plane perpendicular to the rotation axis X and passing through the joint center M (in this case) , This plane corresponds to the plane of FIG. 8), the wall thickness d1 in the region of the recesses 33, 34 of the first yoke arm 11 is the maximum in the region following the recesses 33, 34 with respect to the rotation axis X. Smaller than the wall thickness d2. In this case, the regions of the recesses 33, 34 correspond to the outer part A along the bearing hole with respect to the rotation axis X. The inner part B is attached to the outer part A along the bearing hole 13.

  In this preferred embodiment, the wall thickness d1 of the outer part A in the region of the recesses 33, 34 follows the inner side of the recesses 33, 34 and the remaining inner side that overlaps the roller in the axial direction with respect to the bearing axis Y. Less than the maximum wall thickness of portion B.

  Accordingly, the first yoke arm 11 is fragile in the region of the recesses 33 and 34. Therefore, the first yoke arm 11 is highly elastically deformed in this region, and the bearing load is reduced in this region. Correspondingly, the inner area of the first yoke arm 11 must absorb higher loads, where the bearing load increases. This is evident from the fact that the trapezoid reflecting the bearing load shown in the lower half of FIG. 8 is not so steep. Therefore, the highest bearing load formed is small compared to the prior art and the smallest bearing load is high compared to the prior art. This increases the service life of the journal 25 bearing in the first yoke arm 11.

  As shown in FIG. 4, the first concave portion 33 and the second concave portion 34 are in the direction of the flange 16 or the base portion 10, and at least the first bearing hole 13 is in the direction of the rotation axis X. It extends to the extent extended in the side view of FIG. In this example, the first bearing hole 13 extends farther than the extension.

  5 to 7 show a second mode of the second joint yoke. Components or features corresponding to the components or features of the first aspect are given a reference number that is larger by 100 and will be described in connection with the first aspect.

  Unlike the first embodiment, the two recesses 33 and 34 are connected by third recesses 136 and 136 '. The third recesses 136, 136 ′ extend partially around the bearing axis Y between the bearing axis Y and the base portion 10, and thus around the respective bearing holes 113, 114. Since the two yoke arms 111 and 112 are arranged mirror-symmetrically with each other, the first yoke arm 111 is simply referred to below. The first recess 133 extends from the first free end 117 of the first yoke arm 111 in the direction of the base portion 110, and then extends around the first bearing hole 113 in the circumferential direction. The third recess 136 is connected. The third recess 136 merges with the second recess 134 and continues to the first free end 117 again. Thus, the wall thickness is not reduced only in the cross-sectional plane perpendicular to the rotational axis X, but is disposed perpendicular to the rotational axis X and includes the plane including the bearing axis Y and the base portion 110. The entire area between is also reduced.

  In all aspects, the wall thickness of the yoke arm is not reduced in the outer part along the bearing hole at the free end of the yoke arm or there is no recess in this part.

  This type of design of the recess 133 is particularly suitable when the second joint yoke 107 is formed as a forged part and the forging direction extends parallel to the bearing axis Y.

  FIGS. 9 and 10 show a third aspect of the second joint yoke, in which case the yoke is formed as a forged part. Components or features corresponding to components or features of the first aspect are given the same reference numerals and described in connection with the first aspect.

  The recesses 33 and 34 are arranged to be inclined with respect to the rotation axis X. The recesses 33 and 34 are arranged on a virtual envelope of a virtual cone centered on the rotation axis X. In this case, the conical envelope tapers toward the flange 16. The arrangement of the first concave portion 33 and the second concave portion 34 substantially parallel to the rotation axis X is formed as a forged part, and for a joint yoke whose forging direction extends parallel to the rotation axis X. Particularly preferred.

  11 and 12 show a fourth aspect of the second joint yoke, in which case the yoke is formed as a forged part. Components or features corresponding to components or features of the second aspect are given the same reference numerals and described in connection with the second aspect.

  The recesses 133 and 134 are disposed to be inclined with respect to the rotation axis X. These recesses 133 and 134 are arranged on a conical virtual envelope centered on the rotation axis X. In this case, the conical envelope tapers toward the journal 137. The arrangement in which the first recess 133 and the second recess 134 are substantially parallel to the rotation axis X is formed as a forged part, and the joint yoke whose forging direction extends parallel to the rotation axis X is used for the joint yoke. Particularly preferred.

  Further, the second joint yoke 107 does not have a flange, and has a journal 137 for connection to a shaft member.

  FIGS. 13 and 14 show a fifth aspect of the second joint yoke, in which case the yoke is formed as a forged part. Components or features corresponding to components or features of the fourth aspect are given the same reference numerals and are described in relation to the fourth or second aspect.

  The first recess 133, the second recess 134, and the third recess 136 are forged parts, and the forging direction seems to be particularly suitable when the forging direction extends in the direction transverse to the rotation axis X. Is arranged.

1 universal joint shaft 2 universal joint 3 universal joint 4 shaft 5 first joint yoke 6 first joint yoke 7, 107 second joint yoke 8 second joint yoke 9, 9 'cross assembly with journal 10, 110 base Portions 11, 111 First yoke arm 12, 112 Second yoke arm 13, 113 First bearing hole 14, 114 Second bearing hole 15, 115 Lock groove 16, 116 Flange 17, 117 First free end Part 18, 118 Second free end part 19, 119 First assembly recess 20, 120 Second assembly recess 21 Bearing bush 22 Roller 23 Outer bearing surface 24 Inner bearing surface 25 Journal 26 Base body 27 Pressure plate 28 Sleeve bottom 29 Lock ring 30 Cross member 31 Sleeve wall 32 Upper surface 33, 33 '; 1 3, 133 ′ first recess 34, 34 ′ second recess 35, 35 ′; 135, 135 ′ recess 136, 136 ′ third recess 137 journal A outer part B inner part M joint center X rotation axis Y bearing Axis

Claims (8)

A joint yoke (7, 107) for the universal joint (2), the joint yoke (7, 107) being rotatable about the rotation axis (X);
A first yoke arm (11, 111) having a first bearing hole (13, 113);
A second yoke arm (12, 112) provided with a second bearing hole (14, 114),
The first bearing hole (13, 113) and the second bearing hole (14, 114) are centered on a bearing axis (Y) that intersects the rotation axis (X) at a right angle at the joint center (M). Has been placed,
The yoke arm (11, 12, 111, 112) has an outer portion (A) in the radial direction with respect to the rotation axis (X) and an inner portion (B) adjacent to the outer portion (A). And
The wall thickness (d1) of the yoke arm (11, 12, 111, 112) is perpendicular to the rotation axis (X) and is in a plane passing through the joint center (M). In the joint yoke (7, 107) for the universal joint (2), which is reduced in the radial direction relative to the inner part (B) in the outer part (A),
Each yoke arm (11, 12) has at least two recesses (33, 33 ′, 34, 34 ′) disposed on both sides of each bearing hole (13, 14),
These recesses (33, 33 ′, 34, 34 ′) are at least partially arranged in parallel with the rotational axis (X), and the joint yoke (7) for the universal joint (2) 107).   The wall thickness (d1) of the yoke arm (11, 12, 111, 112) is perpendicular to the rotation axis (X) and is in a plane passing through the joint center (M). The outer portion (A) is arranged in a radial direction with respect to the rotation axis (X) in a plane including the rotation axis (X) and the bearing axis (Y). The joint yoke according to claim 1, wherein it is reduced from the outer part in the region of the free end of the yoke arm (11, 12, 111, 112).   The joint according to claim 1 or 2, wherein the outer portion (A) extends in the direction from the outer end of the bearing hole (13, 14, 113, 114) to the rotation axis (X). yoke.   The wall thickness (d1) of the yoke arm (11, 12, 111, 112) is reduced over most of the circumference around the bearing hole (13, 14, 113, 114). The joint yoke according to any one of 1 to 3.   The yoke arms (11, 12, 111, 112) have recesses (33, 33 ′, 34, 34 ′, 133, 133 ′, 134, 134 ′, 136, 136 ′) on the outer side with respect to the rotational axis (X). The said recessed part is extended along the longitudinal direction of the said outer part of the said bearing hole (13,14,113,114), The any one of Claim 1 to 4 Fitting yoke. The joint yoke (7, 107) has a base portion (10, 110), and the yoke arms (11, 12, 111, 112) protrude in parallel with each other from the base portion (10, 110). And
The joint yoke (7, 107) is a third recess extending at least partially around the bearing axis (Y) between the bearing axis (Y) and the base portion (10, 110). The joint yoke according to any one of claims 1 to 5, having (136, 136 ').   A universal joint (2) comprising the joint yoke (7, 107) according to any one of claims 1 to 6, wherein the joint yoke (7, 107) is interposed via a cross member (30). A universal joint (2) comprising a joint yoke (7, 107) according to any one of claims 1 to 6, which is connected to another joint yoke (5).   The universal joint according to claim 7, wherein the another joint yoke is a joint yoke according to claim 1.

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